Upload worker to CloudFlare

Until we're better

1. Add accountid.txt to src/ with the CloudFlare account id
2. Add worker_name.txt to src/ with CloudFlare worker name
3. zig build run

Steps we take:

1. Check if the worker exists: GET https://api.cloudflare.com/client/v4/accounts//workers/services/<worker_name> 404 - does not exist
2. Add the "script" PUT https://api.cloudflare.com/client/v4/accounts//workers/scripts/<worker_name>?include_subdomain_availability=true&excludeScript=true
3. Get the "subdomain". I believe this is simply to determine the test url: GET https://api.cloudflare.com/client/v4/accounts//workers/subdomain
4. Enable the script: This is only done if the script did not exist. Subsequent flows leave this alone POST https://api.cloudflare.com/client/v4/accounts//workers/scripts/<worker_name>/subdomain Data: { "enabled": true }